Comparison : Item # QM-5-1, QM-5 Mantle, Glas-Col® High-temperature, Spherical
Item # QM-5-2, QM-5 Mantle, Glas-Col® High-temperature, Spherical
Item # QMS-5-3, QM-5 Mantle, Glas-Col® High-temperature, Spherical
Item # QMS-5-4, QM-5 Mantle, Glas-Col® High-temperature, Spherical
Item # QM-5-5, QM-5 Mantle, Glas-Col® High-temperature, Spherical